o o kane



I J.oKANE.

DRAW PLATE# 119.66248. Patented July 2, 1867.

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F15 F l 'Q5 mi Dials vnsxs ca, Morouwmwunlunmu D c l @aitrhtates gamut @fnf `J, O'KANE, OF NEW YORK, N. Y., AssieNORy To RDWARDR-HOTGHK1'ss j t OF BROOKLYN, NRW YORK.

Laim Paten: No. 66,248, dared .my 2, 1867.; @mama June 2o, 1867 IMPROVEMENT IN DRAW-PLATES.

dit Stimuli referat tu in tlgesetettsrs 33mm mit mating pitt uf .tige same.

To ALL WHONIIT MAY OONCRRN: l v v Be it known that I, J. OKANE, ofthe city, county,` and State of'New York, have invented a newand useful Improvement in Draw-Plates for forming cylindrical tubes on the borders of sheet metal, to be applied to the making of hinges and other purposes, of which the following is a full, clear, and exact description, reference beinghad to -the annexed drawings, making part of 'this specificatiomin which- Figure 11's a front view. Y Figure 2 is'a similar view illustrating the manner ofiturning-in the edge ofl thel'metul. j Figure 3 is a. transverse section of the tool. 4 -I Figurel represents a side or face view' of 'a strip of [sheet metal having one of its edges turned in my invention, l i v v I l C Similai` letters Vof reference indicate corresponding parts in allthe figures.

The nature of iny'invention consists in providing a draw-plate with slits in connection with circular holes, said slitsheing designed for the reception of the flat portion of 'the metaLVa-nd 'the corresponding holes for formingrtnbes on the'borders of same. f

This draw-,plate is rnade of a ilat piece of steel, or other suitable metal, ofthe usual form of the drawplate, perforated transversely with four conical holes' a e d, gradually decreasing in size froma to d, figs. 1,v 2i, and 3, d ,being of therequired size of' the tube. These holes'are situated with their centres on u'line parallel to oneedge of .the plate.. Through the aforesaid edge, slits fr r r are out down perpendicularly intojhe holes, parallel to the contiguous sides of the same, and just wide enough to aduit the natal easily, and forming a tangent to the internal circular surfaces of the holes. A piece of metal is then 'fixed ii'rmly to the slotted; edge of the plate by suitable screws or bolts, thus closing the ends of the slits, as shown in the drawing. All sharp edges that would'eut the metal in `its passage are carefully rounded and smoothed away. i It will beY seen that whenconstructed as above describedthe slits r r r r will all be' of 'equal leugth,'meas-.

f'ured from a' planepassing perpendcularly to, then through, the axes of their holes.

To 'use this toolpa strip of metal ofthe requisitewidth is tapered a littleat o'eendandiinsertedinto the largest opening r afat the side of the largest end of the orifice a, the tapering end projecting through thev plate. It is then grasped by the drawing-dogs, and drawn through theplate in the usual manner of tube# drawing. That edge of thc metal next the hole beingforced against its curved side, is turned in or partially rolled up in the act of passing through, as shown at 11g. 3. This processl is repeated through the openings r b and 7' c successively, when the' edge oi the strip, by reason of the contracting sizes of the holesiwill he almost closed against its side, as'shoun at c, iig. 3.' A cylindrical mandrel of the proper size, and alittle longer than the strip of metal, is nekt passed through the cavity formed by the folded border of the metal, one' end being even with the tapered end of the blank', the other end projecting a little. The strip and mandrel are together inserted through the smallest opening r d, land drawn Athrough as before, when the border will be rolled or turned around the mandrel into a cylindrical tube. A collar, exactly fitting the mandrel, is thon slipped over its projecting end, which is passedtlu'ough an opening in the plate, clasped by the dogs, and With-y drawn. The collar, not allowing-the metal to pass, strips it ofi' the mandrel. j

I do not confine my claim to the exact form of, the tool given in the foregoing description, as the combination ofthe slit and circular hole can and should be modified somewhat, according to circumstances, the following among others, viz: i

First. The number of openings a rfb 1' c 1' ci in the-plate, anu tuelrgradations in size, will depenu upon the size of the tube, compared to the thickness onhardness of. the metal. Thus, for a tube of the same size, hard metal will require moregradual folding than 'soft of equal thickness-thick metal more than thin of equal hardness, and vice lversa. The number ofholes, and their gradations in siz e1i1ust vary accordingly.'

Second. ThoughI prefer thoeireular holes slightly conical, as their action` is thus more gradual -on the border .of the metal, they may he, nevertheless, cylindrical, the front ends being well .countersuuk, and all corners and edges hng smoothed away.

Third. Instead of the holes and slits being in one plete, a. series of plates may be used, one liole and slit in each plate.

Fourth. The holes 'may be made all of one size, and the gradctions in the process securedA by varying une lengths of the slits. When the tool is thus constructed the process begins through one of the longer slits, but al small portion of the blank being forced against the circular side of thc hole; the operation is continued through the shorter` slits, more and more being foi-ceci around the curve successively, withv 'the same result as.

with a. graclution in the holes and uniformity in the slits. y

Fifth. Sometimes it is requisite that the flat part of the folded metal should form 'u secant to the tube instead rf n. tangent. ln thisase the tool is modified in form accordingly, the slits and hles forming, inconnection, an opening corresponding to the requisite form of the 4folded piece, the action of the tool and the manner of using being essentially the sanne.

What I'olaixn as new, and desire to secure by Letters Patent, is-

The construction of a druiY-plotewith a communicating slit, 1*, arranged with reference to each hole, substantially as und for the purpose herein specified.

J. O'KANE.

Witnesses:

A. LE CLERC, J. W. Coomns. 

